Figure 1. Action potentials in GLUTag cells.

A, perforated patch recording of a GLUTag cell, showing action potentials in the presence of 10 mm glucose. B, measurement of the action potential threshold by injection of 2 ms depolarizing currents of increasing magnitude. The recording was made in 1 mm glucose, using the perforated patch technique. The current pulse protocol is shown at the bottom and the recorded membrane potential at the top.